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Pregnancy Calculator

Calculate your due date, current week, trimester, and key pregnancy milestones

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About This Tool

Pregnancy Calculator is an online tool that estimates your due date, current pregnancy week, trimester stage, and days remaining based on your last menstrual period (LMP). It also displays a visual pregnancy timeline and key milestones such as heartbeat detection, first movements, and viability — all calculated locally in your browser.

Key Features

Quick Preview

Use Cases

datetime calculator

Frequently Asked Questions

What is the Pregnancy Calculator?

The Pregnancy Calculator is an online tool that estimates your due date, current pregnancy week, trimester, and days remaining based on your last menstrual period. It also shows a visual timeline and key milestones. It runs entirely in your browser with no data sent to any server.

How is the due date calculated?

The due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is the standard Naegele's rule used by healthcare providers worldwide.

What milestones does the calculator show?

The calculator displays key milestones including heartbeat detection (week 6), end of first trimester (week 12), first movements (week 16), halfway point (week 20), viability milestone (week 24), third trimester (week 28), early term (week 37), and due date (week 40).

How are the three trimesters defined?

The first trimester runs from week 1 to week 13, the second trimester from week 14 to week 27, and the third trimester from week 28 to week 40. The visual timeline uses different colors to represent each trimester.

Can I use the Pregnancy Calculator on my phone?

Yes, the Pregnancy Calculator is fully responsive and works on all devices including smartphones, tablets, and desktop computers. The layout adapts to smaller screens for comfortable use.